CVE-2021-43537: debian debian_linux Incorrect Type Conversion or Cast
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2021-43537DEBIAN-CVE-2021-43537
Published 08-12-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-43537 is a high (CVSS 8.8) Incorrect Type Conversion or Cast vulnerability in debian debian_linux. EPSS estimates a 2.17% chance of exploitation in the next 30 days, higher than 82% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
2.17%
0%100%
Low · +0.15 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 30 · Related 14DLA-2863-1DLA-2874-1DSA-5026-1DSA-5034-1MGASA-2021-0551MGASA-2021-0554OPENSUSE-SU-2021:1575-1OPENSUSE-SU-2021:1635-1OPENSUSE-SU-2021:3993-1OPENSUSE-SU-2021:4150-1OPENSUSE-SU-2024:11669-1OPENSUSE-SU-2024:11670-1OPENSUSE-SU-2024:14572-1RHSA-2021:5013RHSA-2021:5014RHSA-2021:5015RHSA-2021:5016RHSA-2021:5017RHSA-2021:5045RHSA-2021:5046RHSA-2021:5047RHSA-2021:5048RHSA-2021:5055SUSE-SU-2021:14859-1SUSE-SU-2021:3993-1SUSE-SU-2021:3995-1SUSE-SU-2021:4000-1SUSE-SU-2021:4150-1USN-5186-1USN-5248-1
Timeline
- 08-12-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 8.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
2.17%
Chance of exploitation in the next 30 days
Percentile
82%
Versus all other CVEs
30-day change
+0.15 pp
From 2.02% on 19-09-2026
19-09-202619-10-2026
EPSS score2.17%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu6 products
- firefox< 95.0+build1-0ubuntu0.18.04.1 | < 95.0+build1-0ubuntu0.20.04.1 | < 95.0+build1-0ubuntu1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- mozjs78All versions (No fix recorded)
Debian3 products
- firefox-esr< 91.4.0esr-1
- thunderbird< 1:91.4.0-1
- debian_linuxEOL9.0 | 10.0 | 11.0
Mozilla3 products
- firefox≥ unspecified, < 95 | < 95.0
- firefox_esr≥ unspecified, < 91.4.0 | < 91.4.0
- thunderbird≥ unspecified, < 91.4.0 | < 91.4.0
3 vendors · 12 products
References
19 links
www.debian.org/security/2021/dsa-5026Vendor AdvisoryX Refsource DEBIANMailing ListThird Party Advisory- lists.debian.org/debian-lts-announce/2021/12/msg00030.htmlMailing ListX Refsource MLISTThird Party Advisory
- www.debian.org/security/2022/dsa-5034Vendor AdvisoryX Refsource DEBIANMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlMailing ListX Refsource MLISTThird Party Advisory